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How to create the most compact mapping n → isprime(n) up to a limit N?
Naturally, for bool isprime(number) there would be a data structure I could query.
I define the best algorithm , to be the algorithm that produces a data structure with lowest memory consumption for the range (1, N], where N is a constant.
Just an example of what I am looking for: I could rep...
Count the items from a IEnumerable without iterating?
Let's say I want iterate on those and write something like processing #n of #m.
19 Answers
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Is there a standard sign function (signum, sgn) in C/C++?
I want a function that returns -1 for negative numbers and +1 for positive numbers.
http://en.wikipedia.org/wiki/Sign_function
It's easy enough to write my own, but it seems like something that ought to be in a standard library somewhere.
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Why would you use Expression rather than Func?
I understand lambdas and the Func and Action delegates. But expressions
stump me.
10 Answers
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I want to get the type of a variable at runtime
I want to get the type of a variable at runtime.
How do I do this?
4 Answers
4
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Print array to a file
I would like to print an array to a file.
12 Answers
12
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Grouped LIMIT in PostgreSQL: show the first N rows for each group?
I need to take the first N rows for each group, ordered by custom column.
5 Answers
5
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Moment js date time comparison
I'm using moment.js to format my date time, here I have two date values, and I want to achieve a particular function when one date is greater than the other. I read most of their docs, but didn't find the function to achieve this. I know it will be there.
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MySQL get row position in ORDER BY
With the following MySQL table:
9 Answers
9
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How can I ssh directly to a particular directory?
I often have to login to one of several servers and go to one of several directories on those machines. Currently I do something of this sort:
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